9-digit Number Puzzle
It has all 9 digits from 1 to 9
It is evenly divisible by 6 and 7
Each time it is rounded (starting with units, then tens, hundreds, etc) it rounds in an alternate pattern (up, down, up ...), until after rounding 8 times the final number is 500000000
After rounding four times the sum of the digits is 24
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